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-rw-r--r--block/blk-integrity.c93
1 files changed, 72 insertions, 21 deletions
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index edce1ef7933d..885cbb59967e 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -32,24 +32,37 @@ static struct kmem_cache *integrity_cachep;
32 32
33/** 33/**
34 * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements 34 * blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
35 * @rq: request with integrity metadata attached 35 * @q: request queue
36 * @bio: bio with integrity metadata attached
36 * 37 *
37 * Description: Returns the number of elements required in a 38 * Description: Returns the number of elements required in a
38 * scatterlist corresponding to the integrity metadata in a request. 39 * scatterlist corresponding to the integrity metadata in a bio.
39 */ 40 */
40int blk_rq_count_integrity_sg(struct request *rq) 41int blk_rq_count_integrity_sg(struct request_queue *q, struct bio *bio)
41{ 42{
42 struct bio_vec *iv, *ivprv; 43 struct bio_vec *iv, *ivprv = NULL;
43 struct req_iterator iter; 44 unsigned int segments = 0;
44 unsigned int segments; 45 unsigned int seg_size = 0;
46 unsigned int i = 0;
45 47
46 ivprv = NULL; 48 bio_for_each_integrity_vec(iv, bio, i) {
47 segments = 0;
48 49
49 rq_for_each_integrity_segment(iv, rq, iter) { 50 if (ivprv) {
51 if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
52 goto new_segment;
53
54 if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
55 goto new_segment;
56
57 if (seg_size + iv->bv_len > queue_max_segment_size(q))
58 goto new_segment;
50 59
51 if (!ivprv || !BIOVEC_PHYS_MERGEABLE(ivprv, iv)) 60 seg_size += iv->bv_len;
61 } else {
62new_segment:
52 segments++; 63 segments++;
64 seg_size = iv->bv_len;
65 }
53 66
54 ivprv = iv; 67 ivprv = iv;
55 } 68 }
@@ -60,30 +73,34 @@ EXPORT_SYMBOL(blk_rq_count_integrity_sg);
60 73
61/** 74/**
62 * blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist 75 * blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
63 * @rq: request with integrity metadata attached 76 * @q: request queue
77 * @bio: bio with integrity metadata attached
64 * @sglist: target scatterlist 78 * @sglist: target scatterlist
65 * 79 *
66 * Description: Map the integrity vectors in request into a 80 * Description: Map the integrity vectors in request into a
67 * scatterlist. The scatterlist must be big enough to hold all 81 * scatterlist. The scatterlist must be big enough to hold all
68 * elements. I.e. sized using blk_rq_count_integrity_sg(). 82 * elements. I.e. sized using blk_rq_count_integrity_sg().
69 */ 83 */
70int blk_rq_map_integrity_sg(struct request *rq, struct scatterlist *sglist) 84int blk_rq_map_integrity_sg(struct request_queue *q, struct bio *bio,
85 struct scatterlist *sglist)
71{ 86{
72 struct bio_vec *iv, *ivprv; 87 struct bio_vec *iv, *ivprv = NULL;
73 struct req_iterator iter; 88 struct scatterlist *sg = NULL;
74 struct scatterlist *sg; 89 unsigned int segments = 0;
75 unsigned int segments; 90 unsigned int i = 0;
76 91
77 ivprv = NULL; 92 bio_for_each_integrity_vec(iv, bio, i) {
78 sg = NULL;
79 segments = 0;
80
81 rq_for_each_integrity_segment(iv, rq, iter) {
82 93
83 if (ivprv) { 94 if (ivprv) {
84 if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv)) 95 if (!BIOVEC_PHYS_MERGEABLE(ivprv, iv))
85 goto new_segment; 96 goto new_segment;
86 97
98 if (!BIOVEC_SEG_BOUNDARY(q, ivprv, iv))
99 goto new_segment;
100
101 if (sg->length + iv->bv_len > queue_max_segment_size(q))
102 goto new_segment;
103
87 sg->length += iv->bv_len; 104 sg->length += iv->bv_len;
88 } else { 105 } else {
89new_segment: 106new_segment:
@@ -162,6 +179,40 @@ int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
162} 179}
163EXPORT_SYMBOL(blk_integrity_compare); 180EXPORT_SYMBOL(blk_integrity_compare);
164 181
182int blk_integrity_merge_rq(struct request_queue *q, struct request *req,
183 struct request *next)
184{
185 if (blk_integrity_rq(req) != blk_integrity_rq(next))
186 return -1;
187
188 if (req->nr_integrity_segments + next->nr_integrity_segments >
189 q->limits.max_integrity_segments)
190 return -1;
191
192 return 0;
193}
194EXPORT_SYMBOL(blk_integrity_merge_rq);
195
196int blk_integrity_merge_bio(struct request_queue *q, struct request *req,
197 struct bio *bio)
198{
199 int nr_integrity_segs;
200 struct bio *next = bio->bi_next;
201
202 bio->bi_next = NULL;
203 nr_integrity_segs = blk_rq_count_integrity_sg(q, bio);
204 bio->bi_next = next;
205
206 if (req->nr_integrity_segments + nr_integrity_segs >
207 q->limits.max_integrity_segments)
208 return -1;
209
210 req->nr_integrity_segments += nr_integrity_segs;
211
212 return 0;
213}
214EXPORT_SYMBOL(blk_integrity_merge_bio);
215
165struct integrity_sysfs_entry { 216struct integrity_sysfs_entry {
166 struct attribute attr; 217 struct attribute attr;
167 ssize_t (*show)(struct blk_integrity *, char *); 218 ssize_t (*show)(struct blk_integrity *, char *);